Testing of Eight Medicinal Plant Extracts in Combination with Kresoxim-Methyl for Integrated Control of Botrytis cinerea in Apples

Burtram C. Fielding, Cindy-Lee Knowles, Filicity A. Vries and Jeremy A. Klaasen
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Burtram C. Fielding: Molecular Biology and Virology Laboratory, Department of Medical BioSciences, Faculty of Natural Sciences, University of the Western Cape, Bellville 7535, South Africa
Cindy-Lee Knowles: Plant Pathology Laboratory, Department of Medical BioSciences, Faculty of Natural Sciences, University of the Western Cape, Bellville 7535, South Africa
Filicity A. Vries: Fruit, Vine and Wine Institute of the Agricultural Research Council, ARC Infruitec-Nietvoorbij, Private Bag X5026, Stellenbosch 7599, South Africa
Jeremy A. Klaasen: Plant Pathology Laboratory, Department of Medical BioSciences, Faculty of Natural Sciences, University of the Western Cape, Bellville 7535, South Africa

Agriculture, 2015, vol. 5, issue 3, 1-12

Abstract: Botrytis cinerea is a fungus that causes gray mold on many fruit crops. Despite the availability of a large number of botryticides, the chemical control of gray mold has been hindered by the emergence of resistant strains. In this paper, tests were done to determine the botryticidal efficacy of selected plant extracts alone or combined with kresoxim-methyl. In total, eight South African medicinal plants viz Artemisia afra , Elyptropappus rhinocerotis , Galenia africana , Hypoxis hemerocallidea , Siphonochilus aetheopicus, Sutherlandia frutescens , Tulbaghia violacea and Tulbaghia alliacea were screened. Allium sativum , a plant species known to have antifungal activity, was included in the in vivo studies. For the in vitro studies, synergistic interactions between the plant extracts and the kresoxim-methyl fungicide were tested with radial growth assays. Data indicated synergistic inhibitory effects between the fungicide and the plant extracts. Next, different doses of plant extracts combined with kresoxim-methyl were used for decay inhibition studies on Granny Smith apples. Synergistic and additive effects were observed for many of the combinations. Even though this study was done using only one strain of B. cinerea , results showed that the tested indigenous South African plant species possess natural compounds that potentiate the activity of kresoxim-methyl.

Keywords: Botrytis cinerea; gray mold; kresoxim-methyl; medicinal plants; plant extracts; strobilurin; fungicides (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2015
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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